Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

Sigurd — Thu, 09 Mar 2017 10:29:46 GMT

Hi,

Yes, 128 µs it the minimum sampling period. We don't offer any chips that have a lower sampling period than this.

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

wyn — Thu, 09 Mar 2017 07:01:34 GMT

Hello,

Is the minimum sampling period of nRF51 series is 128 us? It looks like the sampling rate is too slow to detect the rotary motion for servo control with phase change rate over than 50000 phase per second. Is there any other chip contain better quadrature decoder suitable for servo control?

Thanks, Wayne

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

wyn — Sat, 11 Feb 2017 00:23:23 GMT

thanks a lot.

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

Sigurd — Fri, 10 Feb 2017 14:58:23 GMT

Yes, the LED pin on the QDEC is used to control(turn off/on) the LED on the AEDR-8300 in order to keep the power levels to a minimum. On this infocenter link you can read more about it:

"The LED output follows the sample period, and the LED is switched on a given period before sampling and switched off immediately after the inputs are sampled. The period the LED is switched on before sampling is given in the LEDPRE register."

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

wyn — Fri, 10 Feb 2017 06:37:46 GMT

Thanks. Is the LED pin used for pwm control for power saving? in my usage encoder's led was fed by vdd with resistor directly.

RE: Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

Sigurd — Thu, 09 Feb 2017 10:22:44 GMT

Hi,

I don't think that should be any problem. It uses a standard 90 degree state width, so the waveform should be supported.